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Alternative TitleCyclic Heat Treatment and Spheroidizing Mechanism of Titanium Alloy Welding Microstructure
陆莹1; 乔红超1; 曲楠2; 赵吉宾1
Source Publication稀有金属材料与工程
Indexed BySCI ; EI ; CSCD
EI Accession number20191406724112
WOS IDWOS:000457815200037
Contribution Rank1
Funding Organization辽宁省自然科学基金(2015020115) ; 国家重点研发计划(2016YFB1102704)
KeywordTC4钛合金 焊缝组织 循环热处理 球化机制
Abstract本文针对钛合金焊缝组织不均匀、脆性大、塑性差等问题,提出一种针对焊接接头的新型热处理工艺:α+β与α两相区循环热处理,讨论了不同热处理工艺对组织形貌的影响情况, 得到由具有一定比例的等轴α相、条状α相及β转变相组织,提高循环次数球化的α相增多,长径比明显减小,有明显的球状的α相,其长径比普遍小于3,除此之外在球化的α相周围分布着取向各有不同的细小条状α相。经过四次循环热处理的焊接接头拉伸得到强塑积达到14441.17 MPa?%,焊接接头的塑性有所提高。结合EBSD、TEM等测试结果的分析,解释了该现象产生的原因,解释针状α相的断裂及条状α相的长大,在热处理过程中位错、孪晶的移动形成的亚晶界及β相的分解促进了热蚀坑的形成过程。
Other AbstractConsidering the issues of coarse microstructure and awful mirco-orientation distribution of TC4 titanium alloy welded-joint with high friability and low plasticity, a post welding cyclic heat treatment between alpha+beta and beta-transus temperature were designed, and the effect of different heat treatment processes on the tissue morphology was discussed. The tri-modal microstructure of equiaxial alpha phase, lamellar alpha and transformed beta phase was obtained. Results show that when the cyclic times increase, more spheroidized alpha phases appear, and the length to diameter ratio decreases significantly, which is generally less than 3. In addition, there are different kinds of small bars of alpha phase around spheroidized alpha phase. After four times cyclic heat treatment, the product of strength and elongation of the welded joint achieves 14441.17 MPa.% and the plasticity of the joint increases. The phenomenon is explained by analyses of EBSD and TEM. Besides, the fracture of needle-like alpha phase and growth of alpha phase in bar are also explained. In the process of heat treatment, the sub-boundary caused by the movement of dislocation and twins and decomposition of beta phase promote the formation of thermal etching pits. In conclusion, the designed heat treatment can homogenize the welding microstructure and relieve the stress concentration, which is of great practical value in aerospace field.
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
Funding Project辽宁省自然科学基金
Project Number2015020115
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
Corresponding Author陆莹
Recommended Citation
GB/T 7714
陆莹,乔红超,曲楠,等. 钛合金焊缝组织循环热处理及球化过程分析[J]. 稀有金属材料与工程,2019,48(1):254-262.
APA 陆莹,乔红超,曲楠,&赵吉宾.(2019).钛合金焊缝组织循环热处理及球化过程分析.稀有金属材料与工程,48(1),254-262.
MLA 陆莹,et al."钛合金焊缝组织循环热处理及球化过程分析".稀有金属材料与工程 48.1(2019):254-262.
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